Device for providing twist in rovings



Sept. 16, 1941. I K U I 2,256,436

DEVICE FOR PROVIDING TWIST IN ROVINGS PREPARATORY T0 SPINNING Filed Nov. 14, 1939 F'IGJ Patented Sept. 16, 1941' DEVICE FOR rnovmmc 'rwrs'r IN novmcs rnnralmromrwo SPINNING Arthur Kruse, Logelbach, France Application November 14,1939, Serial In France November 25, 1938 4 Claims.

The present invention relates to a device for imparting twist to textile rovings which are intended to be used in spinning as a preparatory material for the machines ;that efiect the sub-' sequent operations. Said device provides the possibility of delivering such twisted rovings directly into cans, instead of winding them into the shape of bobbins on complicated machines, as for example fiyer frames.

The invention furnishes the solution'of the problem which consists in imparting twist to rovings which .are delivered into any receptacle, for example a can, by a pair of delivery rollers, without such twist being obtained by the rotation of the receptacle. Said rotation would in fact have to be too quick in order to produce the requisite twist, and it might furthermore disintegrate the roving stored in the receptacle,

- owing to centrifugal force.

The operation of the device is'as follows:

The roving delivered by a'pair of rollers engages in a tubular spindle-(spindle drilled in the longitudinal direction) located at some distance from the rollers. This drilling is efie'cted in such a manner as to allow the roving to pass freely in the front part of the spindle, the diameter of the tube of the rear portion being on the contrary so reduced that the roving is sumciently tight therein for the spindle to carry it with it as it rotates and impart twists thereto. A second pair of rollers nips the roving very near the outlet of the spindle and delivers it into a receptacle (can). In order to prevent the twists, which cans, which moves downwards as the load of delivered roving increases, and moves upwards again as said load decreases.

The application of this device, for example in cotton spinning, provides several advantages, the most important of which is the possibility of already producing, on machines of the drawing type, roving which is finer and stronger than usual. It is possible, owing to this fact, to eliminate one or a plurality of passes on the fiyer frames and to supply directly the last pass on the flyer frames which produce the roving for the continuous or mule spinning machines. The greater content of the cans, as compared with that of the'bobbins of roving, substantially decreases the number of joints to be made and consequently the number of defects. to introduce separately into a single as three or four previously twisted fine rovings, and to supply with cans as many as four spindles of the following machine. Theme of this device even enables in the manufacture "of coarse can as many yam the finishing machines that produce such yarns to be supplied direct from the cans.

are left hand and right hand, from mutually Y eliminating each other, the tubular rotary motion is periodically stopped. The duration of these stoppages of the spindle is adjusted proportionally to the time required to deliver a length of roving equal to the distance between the two pairs of rollers between which the tubular spindle is mounted. The durations of the successive periods of rotation depend, taking into account the revolutions per unit time, on the speed of travel of the roving. The rotation should start again after the stoppage approximately when the whole roving section has been twisted during the previous period and is on the point of completely issuing from the spindle, and should stop when the twist has moved up wards along the roving nearly to the first supply rollers. It is therefore indispensable for the twisted roving issuing from the second rollers to be received very close to same and always at the upper part of the can, for example by means of a spring-pressed disc, oftenused in roving .the tube C is of smaller All these advantages which have been enumerated result in economy in the purchase price and upkeep costs of the machines, and also in the cost of labour in manufacture.

The accompanying drawing shows an example of the device in uestion and its principle of application.

Fig. 1 shows a longitudinal section of an embodiment of. the tubular spindle with supports and its accessory members; these details of con-' struction may be modified as will be stated hereinafter. The most important part is the tubular spindle itself, A. It comprises an internal tube C, the inlet B of which is shaped like a hopper for accommodating the diameter and forms the hollow point of the spindle E. As shown in Fig. 1, this part may be removable, in order to'enable interchangeable parts E to be used, the tube F of which is adapted as regards its diameter to the count of the roving being worked. In Fig. l. the spindle A is mounted in a bush G, in such a manner that it can be withdrawn so as to enable the roving to be threaded therein, for example by means of a wire hook. The bush G is secured to a small driving pulley H which is provided, in the drawing, for a string drive, but which may also be shaped like a pulley or be constructed in the shape of a gear, according to the means whereby it is desired to transmit the rotary movement thereto. A pin D is fixed in It is possible roving. The end F of 4 2 the head of the spindle A and penetrates freely into a small housingof the bush G, so that the latter can impart a rotary movement to the spindle A. The drive could also be effected by any other means, for example a groove inside the bush and a small key of the spindle freely entering said groove. The bush G is lodged in two bearings I in which are provided lubricating holes J. It would also be possible to provide a construction with a single bearing of suificient width or again a construction'with one or a plurality of ball bearings. The shape of said tubular spindle enables the roving to be delivered both during thegperiods of rotation of the spindle and during the periods of stoppage, so that the delivery of the roving always remains that which corresponds to the speed of the two pairs of rollers between which the device is mounted.

Fig. 2 shows the principle of application of said device. The two rollers L are the delivery rollers of a usual rolling train. The roving delivered by the rollers L encounters, at a certain distance, the spindle A of the device, passes through said spindle and is nipped as it comes out of the point E, by a second pair of rollers N which deliver it to a can P provided with a movable bottom 0 urged by a spring Q which always keeps the receiving surface of the roving at the upper part of the can. The spindle A is lodged in two bearings I and is driven by the pulley H provided with a string which comes from the drum K, which drum may be replaced by a pulley. The drum K receives, by appropriate means, for example a friction coupling controlled by, an eccentric, the rotary motion broken by successive stoppages, the nature of which has already been specified in the description of the operation of the device.

What I claim is:

1. A device for imparting twist. to rovings preparatory to spinning, which comprises, in combination, a pair of delivery rollers which feed the roving with a continuous movement, a tubular spindle through which the roving passes after leaving the said rollers, a collector receptacle, a second pair of delivery rollers for delivering the roving to said receptacle, the said spindle being adapted to impart right-hand and left-hand twists to said roving, and means; for imparting to said tubular spindle alternate right-hand and left-hand rotary movements and intermediate periods of rest for intervals of time which are proportional to the speed of feed of the roving and to the time requiredby a point on the roving to pass from the first pair of rollers to the second pair of rollers.

2. A device for imparting twist to rovings preparatory to spinning, which comprises, in comassesses roving with a continuous movement, a tubular spindle through which the roving passes alter leaving the said rollers, a collector receptacle, a second pair of delivery rollers for delivering the roving to said receptacle, the said spindle being adapted to impart right-hand and left-hand twists to said roving, and means for imparting to said tubular spindle alternate right-hand and left-hand rotary movements and intermediate periods of rest for intervals of time 'which are proportional to the speed of feed of the roving and to the time required by a point on the roving to pass from the first pair of rollers to the second pair of rollers, said tubular spindle bein Provided with a reduced outlet orifice and an outlet end of tapered shape and being positioned adjacent the linev oi contact of the rollers 01 said sec- ,ond pair.

3. A device tor imparting twist to rovings preparatory to spinning, which comprises, in combination, a pair of delivery rollers which feed the roving with acontinuous movement, a tubular spindle through which the roving passes after leaving the said rollers, a collector receptacle, a second pair of delivery rollers for delivering the roving to said receptacle, the said spindle being adapted to impart right-hand and left-hand twists to said roving, and means for imparting to the said spindle alternate right-hand and leithand rotary movements and intermediate periods 4 of rest, said tubular spindle comprising a spinning tube through which the roving-to be twisted passes, a rotary sleeve in which the said tube is mounted, and coupling means interposedbetween said spindle and tube.

4. A device for. imparting twist to rovings preparatory to spinning, which comprises, in combination, a pair of delivery rollers which feed the roving with a continuous movement, a tubular spindle through which the roving passes after leaving the said rollers, a collector receptacle, a secondpair of delivery rollers for delivering the roving to said receptacle, the said spindle being adapted to impart right-hand and left-hand twists to said roving, and means for imparting to said tubular spindle alternate right-hand andv proportional to the speedo! feed of the roving bination, a pair of delivery rollers which feed the and to the time required by a point on the roving to pass from the first pair of rollers to the second pair of rollers, and means for delivering the twisted roving to the said receptacle in a plane closely adjacent said second delivery rollers, whereby the right-hand twists and left-hand twists-are retained by the roving collected in said receptacle.

ARTHUR KRUSE. 

